const MIN_DISTANCE = 10

function getDirection(x, y) {
  if (x > y && x > MIN_DISTANCE) return 'horizontal'

  if (y > x && y > MIN_DISTANCE) return 'vertical'

  return ''
}

export const touch = Behavior({
  methods: {
    resetTouchStatus () {
      this.deltaX = 0
      this.deltaY = 0
      this.offsetX = 0
      this.offsetY = 0

      this.direction = ''
    },


    touchStart (event) {
      this.resetTouchStatus()

      const touch = event.touches[0]

      this.startX = touch.clientX
      this.startY = touch.clientY
    },

    touchMove (event) {
      const touch = event.touches[0]

      this.deltaX = touch.clientX - this.startX
      this.deltaY = touch.clientY - this.startY

      this.offsetX = Math.abs(this.deltaX)
      this.offsetY = Math.abs(this.deltaY)

      this.direction = this.direction || getDirection(this.offsetX, this.offsetY)
    }
  }
})